1, protected by law. The contract law does not stipulate that the contract must be in Chinese, so it is allowed but not prohibited according to the civil law, so what language is used is your problem.

2. Contract litigation in pure foreign languages does exist in reality and is allowed. But generally speaking, the court will ask you to provide a translated version of the contract text for the court's reference, but the details should be in a foreign language. This is the problem of proof.